Improvement in extension-ladders



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JOHN BERG, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN EXTENSION-LADDERS.

Specification forming part of Letters Patent No. [95,563, datedSeptember 25, 1877; application filed I February 27, 1877.

To all whom it may concern Be it known that I, JOHN BERG, of Chicago, inthe county of Cook and State of Illinois, have invented new and usefulImprovements in Extension Ladders; and I do hereby declare the followingto be a full, clear, and exact description thereof, which will enableothers skilled in the art to which my invention appertains to make anduse the same, reference being had to the accompanying drawing, formingpart of this specification, in which- Figure 1 represents a frontelevation of an extension-ladder embodying my said invention. Fig. 2represents a sectional elevation of the same. Fig. 3 represents asectional plan of the same, taken on the line m min Fig. l; and Fig. 4represents a diminished side elevation of the same, when adjusted toform a step-ladder.

Like letters of reference indicate like parts.

The object of my invention is to provide a ladder so constructed as toadmit of being readily extended or contracted, and to admit of being soadjusted as to form a step-ladder; and to that end my invention consistsin the arrangement of the several parts, as hereinafter more fullydescribed and claimed.

In the drawing, A represents the lower section of the ladder, which maybe made in the usual form, and A represents the upper section, and whichis of the proper width laterally to fit loosely between the side railsof the lower section A. G 0 represent wrought or cast metal clasps,permanently attached to the side rails of the lower section A at or neartheir upper ends, and are so formed as to take around the side rails ofthe upper section A, as shown in Fig. 3. .Each of said clasps isprovided with an anti-friction wheel,

a, journaled therein, and so adjusted as to bear lightly against theedge of the side rails of the section A to relieve the friction of theside rails against the clasps when extending or elevating the section A.The side rails of the section A are each provided near the lower endwith a hook, (1, so arranged as to take around the rounds of the lowersection A and to support the section A in an elevated position, as shownin Fig. 2.

The upper end of the side rails of section A are rounded off on the backto allow the lower end of both sections to be set apart without causingthe ends of the side rails of section A to bind between the upper roundof section A and the wheels at a when the sections are adjusted to forma step-ladder.

To adjust said ladder so as to render it capable of use as astep-ladder, it is only necessary to contract the same longitudinally,and

separate the lower ends of the sections, allowing the upper ends of theside rails of the section A to rest between the wheels act and the upperround of the section A, as shown in Fig. 4.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination, with the section A, having the clasps O G attached tothe upper end of the side rails thereof, and provided with theanti-friction wheels a a, of the section A, having the back of the siderails rounded off at the upper end, and provided at the lower end withthe hooks d d, substantially as and for the purpose specifie JOHN BERG.

Witnesses:

N G. GRIDLEY, N. H. SHERBURNE.

